Definition of frighteningly adverb from the Oxford Advanced Learner's Dictionary

 

frighteningly

 adverb
adverb
BrE BrE//ˈfraɪtnɪŋli//
 
; NAmE NAmE//ˈfraɪtnɪŋli//
 
 
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in a way that makes you feel afraid The battle scenes were frighteningly realistic.